package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.dto.DishDto;
import com.itheima.entity.Dish;
import com.itheima.entity.DishFlavor;
import com.itheima.mapper.DishMapper;
import com.itheima.service.DishFlavorService;
import com.itheima.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.yaml.snakeyaml.events.Event;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;
    /**
     * 新增菜品，同时保存对应的口味数据
     * @param dishDto
     */
    //操作了两张表，那么为了保证数据的一致性，我们需要在方法上加上注解 @Transactional来控制事务。
    @Transactional
    public void saveWithFlavor(DishDto dishDto) {

//        //保存菜品的基本信息到菜品表dish
//        this.save(dishDto);
//
//        //②. 获取保存的菜品ID ;
//        Long dishDId = dishDto.getId();
//
//        //③. 获取菜品口味列表，遍历列表，为菜品口味对象属性dishId赋值;
//        List<DishFlavor>flavors = dishDto.getFlavors();
//        flavors=flavors.stream().map((item)->{
//           item.setDishId(dishDId);
//           return item;
//
//           //重新转成list 重新把list里面的元素加工一下，把dishId赋好值，最终还是变成一个集合赋值给自己
//        }).collect(Collectors.toList());
//
//        //保存菜品口味数据到菜品口味表dish_flavor
//        dishFlavorService.saveBatch(flavors);

        this.save(dishDto);
        Long dishId = dishDto.getId();
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map((item)->{
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);
    }



    /**
     * 根据id查询菜品信息和对应的口味信息   回显
     * @param id
     * @return
     */

    public DishDto getByIdWithFlavor(Long id) {
        //查询菜品基本信息，从dish表查询
        Dish dish = this.getById(id);

        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish,dishDto);

        //查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor>queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dish.getId());
        List<DishFlavor> flavors = dishFlavorService.list(queryWrapper);

        dishDto.setFlavors(flavors);

        return dishDto;
    }

    /*
    * 修改菜品信息                保存
    */
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {

        //更新dish表基本信息
        this.updateById(dishDto);

        //清理当前菜品对应口味数据---dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        //select * from dish_flavor where dishid = ?
        queryWrapper.eq(DishFlavor::getDishId, dishDto.getId());

        dishFlavorService.remove(queryWrapper);

        //添加当前提交过来的口味数据---dish_flavor表的insert操作

        List<DishFlavor> flavors = dishDto.getFlavors();

        flavors = flavors.stream().map((item)->{
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);

    }


}
